vacuum secondary question

[Werner R.]

ok. my baby is a 64 with a 427 and hydraulic lifters; 4" restricted flow hooker sidepipes. a good driver. holley 1850. i used a hairpin on the secondary shaft and took the car out for some back road acceleration tests. quit when i reached 90+ mph.

the hairpin had moved about 1/4 to 5/16 inch down the shaft. does this suggest full opening of the secondaries, or should i look for greater hairpin travel??

if it is not full opening, should i put in lighter springs [i have the plain standard spring in there now].

also, i did read some internet advice that said the check ball should be removed [for earlier secondary activation]. i have mine in place.

any advice appreciated. happy motoring and wrenching to all [i almost said happy wenching, but at my age "wrench" comes to mind].

[John H.]

Re: vacuum secondary question

also, i did read some internet advice that said the check ball should be removed [for earlier secondary activation]. i have mine in place.

Werner -

Typical bad internet advice. Leave the check ball alone - if it's removed, the secondaries will "snap" open and you'll get a "bog" due to inadequate initial fuel flow in the secondaries.

[Clem Z.]

Re: vacuum secondary question

here are holley specs on the different springs.